Four-cylinder compression sprayer

Abstract

The application discloses a four-cylinder compression spraying machine and belongs to the field of coating equipment. The four-cylinder compression spraying machine integrates a direct-current brushless motor, a four-cylinder vertical oil-free piston air compressor, an air storage tank, a pressure regulating and filtering unit and a pressurized paint tank on a frame provided with traveling wheels, and the internal air path is extremely short. The four-cylinder pistons work alternately with a phase difference of 180 degrees, and supply air to the air storage tank through parallel double one-way valves, thereby significantly reducing exhaust pulsation. The brushless motor is started and stopped or runs at a variable speed according to pressure, thereby realizing wide voltage adaptation and on-demand air supply, and zero energy consumption when no air is sprayed. When the all-in-one machine sprays thick coating such as real stone paint, air pressure fluctuation is extremely small, noise and vibration are low, energy consumption is saved, the all-in-one machine is convenient to carry, and almost no maintenance is needed in daily use, and the problems of traditional split system equipment, such as being scattered, unstable pressure, high energy consumption and large noise, are overcome.

Description

Technical Field

[0001] This application relates to the field of spraying equipment technology, and in particular to a four-cylinder compression sprayer suitable for spraying applications requiring stable and large flow rates, such as stone paint, textured coatings, and metal anti-rust paint. Background Technology

[0002] In architectural and industrial coatings, air spraying is the mainstream method. Most construction sites still use a split-system approach: a separate piston air compressor serves as the air source, towing an air tank, which is then connected to an oil-water separator and pressure regulating valve via air pipes, leading to a separate pressure paint tank, and finally to the spray gun. The entire system often requires three or four large components, plus several meters of air and paint hoses.

[0003] This combination has revealed many old problems in actual construction. One is that transportation and cleanup are very time-consuming. Every time you change floors or rooms, you have to rewire, reconnect pipes, check for leaks, and adjust the pressure, so the effective spraying time in a day is not long. Another problem is that the air supply pressure is difficult to stabilize. With a long air hose, the pressure in the pipeline will fluctuate when the spray gun is turned on and off, and the pressure in the paint tank will change accordingly. Especially when spraying stone paint or thick paint, it is easy to cause the paint particles to be coarse and fine, or even drip. In order to control the pressure at a distance, the air compressor output usually has to be set too high, which consumes a lot of extra electricity. Moreover, the no-load loss of traditional AC motors is also considerable, and the noise is often 80 or 90 decibels, which often leads to complaints when working in residential areas. In addition, condensation will be generated during the cooling process of the long air hose. If the filtration is not adequate, water and oil mist will mix into the paint, causing pinholes and blistering. Maintenance is also troublesome: the air compressor needs oil and carbon brushes changed, the filter needs filter element replaced, and the seals of the paint tank need to be checked frequently, as any leak will cause problems.

[0004] Although some "all-in-one" machines have appeared on the market that combine an air compressor and a paint canister on the same cart, most of them are simply assembling the original independent components onto a frame. The air circuit is still long and convoluted, and the air compressor is still a common single-cylinder or double-cylinder AC motor type. The problems of large pressure fluctuations, high noise, and high energy consumption are almost unchanged. In other words, those assembled all-in-one machines do not solve the fundamental problems from a systemic perspective. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a four-cylinder compression spraying machine, which aims to make the equipment easy to transport while truly achieving the air supply stability and energy-saving and quiet effect that is difficult to achieve with a split machine.

[0006] The technical solution adopted in this embodiment of the invention is as follows: A four-cylinder compression spraying machine, comprising: Mobile racks; The power compression assembly, supported on a frame by a shock-absorbing base, includes a DC brushless motor and a four-cylinder piston air compressor driven by it; the four-cylinder piston air compressor has four vertically arranged cylinders, the cylinder pistons are connected to a crankshaft via connecting rods, and the phase difference of each crank is configured to make the four pistons alternately compress and perform work; the exhaust ports of each cylinder are collected through an exhaust manifold and then connected to the air inlet of an air tank through at least two parallel one-way valves; The gas storage tank is fixed on the frame, and the tank body is equipped with a pressure sensor and a safety valve. The pressure regulating filter unit has its inlet connected to the outlet of the gas storage tank via a pipeline, and internally has at least one oil-water separator and a manual pressure regulating valve connected in series. The sealing material tank is equipped with an air inlet and a discharge outlet. The air inlet is connected to the outlet of the pressure regulating filter unit via an air pipe, and the discharge outlet is connected to the spray gun via the paint filter inside the tank and an external delivery pipe. The control panel is mounted on the rack, and the brushless DC motor and pressure sensor are both electrically connected to the control panel.

[0007] Optionally, the brushless DC motor is equipped with an AC-DC converter and a drive controller. The controller has an input voltage range of 160V to 260V and controls the start / stop or speed of the motor according to the pressure sensor signal of the gas storage tank to achieve on-demand gas supply.

[0008] Optionally, the four-cylinder piston air compressor is an oil-free lubricated type, with the four cylinders arranged vertically in a rectangular array, and the crankshaft crank phases differing by 90° sequentially; the two parallel one-way valves are spring-reset type structures, placed between the exhaust manifold and the air tank to increase the flow area, reduce exhaust resistance, and prevent gas backflow.

[0009] Optionally, the bottom of the mobile frame is equipped with directional wheels and universal wheels with brakes, and the shock-absorbing base is composed of multiple rubber shock absorbers.

[0010] Optionally, the gas storage tank is a vertical pressure vessel with a water collection structure at the bottom that is inclined toward the drain valve; the pressure regulating filter unit includes a centrifugal coarse separator and a precision filter element connected in series, and the bottom of the coarse separator is equipped with a manual drain valve.

[0011] Optionally, the sealing material container is equipped with an agitator driven by compressed air or electricity.

[0012] Optionally, the control panel integrates an AC-DC power conversion module and a brushless motor drive controller. The brushless motor drive controller is electrically connected to the pressure sensor on the gas tank to obtain the pressure signal, and is electrically connected to the DC brushless motor to control its start-stop and speed. The control panel is equipped with a main power switch, an emergency stop button, a running status indicator light, and a digital display of the gas tank pressure. The emergency stop button is connected in series in the enable circuit of the brushless motor drive controller.

[0013] Optionally, the controller of the brushless DC motor has a speed regulation function, which can automatically switch between low speed and high speed according to the rate of pressure drop in the gas tank to achieve variable gas supply.

[0014] Optionally, the sealing material container is equipped with a replaceable inner bag or a bottom quick-drain cleaning port.

[0015] Optionally, the spray gun is an air atomizing spray gun, in which atomizing compressed air is drawn from the air tank through an independent air pipe, and the paint is squeezed out under the action of air pressure in the tank and atomized by the compressed air at the gun body.

[0016] The technical solutions provided by the embodiments of this application may include the following beneficial effects: As can be seen from the above embodiments, the staggered operation of the four cylinders in this application results in very dense and shallow exhaust pulses. Combined with the pressure stabilization of the air tank, the pressure delivered to the paint tank is very stable. In actual testing, when spraying stone paint, the pressure fluctuation of the spray gun is significantly less than that of a traditional two-cylinder split-type machine, resulting in uniform paint grains and reducing the likelihood of unevenness and streaks. The brushless motor, combined with the short air path, provides fast start-up, rapid pressure build-up, and very quick pressure control response.

[0017] The brushless motor starts and stops on demand, completely cutting off power when not in use. Combined with its wide voltage adaptability, it maintains normal pressure output even in construction sites with unstable voltage. Using the same amount of time and the same paint, actual power consumption is significantly lower than that of a split air compressor system. The four-cylinder vertical layout offers good balance, and the brushless motor itself eliminates carbon brush friction noise, resulting in operating noise levels that are more than ten decibels lower than common oil-lubricated AC air compressors. Vibration is also much lower, making it less of a nuisance during construction in high-rise buildings.

[0018] Everything is on one shelf, the air hoses are extremely short, and there are virtually no leaks or pressure losses. Routine maintenance only requires periodically cleaning the intake filter and draining water from the air tank; there's no need to change the oil or worry about the carbon brushes, saving a lot of trouble. Operation is also simple; all parameters can be set at once on the control panel, eliminating the need to go to each component to adjust them like with a split-type air conditioner.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a four-cylinder compression spraying machine according to one embodiment of the present invention.

[0022] Figure 2 This is a front view structural schematic diagram of a four-cylinder compression spraying machine according to one embodiment of the present invention.

[0023] Figure 3 This is a left-side structural schematic diagram of a four-cylinder compression spraying machine according to one embodiment of the present invention.

[0024] Figure 4 This is an enlarged view of the connection between a four-cylinder air compressor and an air tank according to one embodiment of the present invention, showing a parallel one-way valve.

[0025] Figure 5 This is a schematic diagram of the principle of a four-cylinder compression spraying machine according to one embodiment of the present invention.

[0026] In the diagram: 1. Four-cylinder piston air compressor; 2. High-pressure manifold; 3-1. First spring-return check valve; 3-2. Second spring-return check valve; 4. Air tank; 5. Short pipe; 6. Pressure regulating filter unit; 7. Air outlet pipe; 8. Paint filter; 9. Paint; 10. Sealing material tank; 11. Feed pipe; 12. Air spray gun; 13. Mobile frame; 14. DC brushless motor; 15. Wheels; 16. Handrail; 17. Control panel; 18. Shock-absorbing base; 19. Intake air filter; 20. Safety valve; 21. Pressure sensor; 22. Drain valve; 23. Crankshaft; 24. Exhaust manifold; 25. Pneumatic agitator motor; 26. Agitator air supply pipe. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application.

[0028] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0030] Example 1: like Figures 1 to 5 As shown, the four-cylinder compression sprayer of this embodiment includes a mobile frame 13, a power compression assembly, an air tank 4, a pressure regulating and filtering unit 6, a paint tank 9, and a control panel 17.

[0031] The mobile frame is welded from rectangular steel pipes, with four wheels at the four corners. The two front wheels are swivel casters with brakes, and the two rear wheels are fixed casters. There is a push handle 16 at the rear for easy pushing and moving. A mounting plate is fixed to the base plate by four rubber shock-absorbing seats, and the power compression assembly rests on the mounting plate.

[0032] The power compression assembly, supported on a frame by a shock-absorbing base 18, includes a DC brushless motor 14 and a four-cylinder piston air compressor driven by it. The rated power of the DC brushless motor 14 is 1.8kW. The four-cylinder piston air compressor has four vertically arranged cylinders. The cylinder pistons are connected to a crankshaft 23 via connecting rods. The phase difference of each crank is configured to allow the four pistons to alternately compress and perform work. The transmission ratio is 1.2:1. The crankshaft 23 housing is made of die-cast aluminum alloy. The four cylinders are arranged vertically in a square shape, with a cylinder diameter of 48mm and a stroke of 20mm. The pistons are made of aluminum alloy with a self-lubricating coating, and the piston rings are made of polytetrafluoroethylene filled with carbon fiber, requiring no oil. The four cranks on the crankshaft 23 have a phase difference of 90°, and the pistons perform work in a staggered manner. The cylinder intake ports are connected to a common intake filter 19, and the exhaust ports are connected to the exhaust manifold 24. The outlet of the manifold is connected to two identical spring-return check valves 3-1 and 3-2. The other ends of the two valves are joined together and connected to the bottom intake port of the air tank 4 via a high-pressure pipe with an inner diameter of 12mm. The parallel check valves are mainly used to increase the flow cross-section, reduce the exhaust back pressure, and also to prevent gas backflow when the machine stops.

[0033] The gas storage tank 4 is fixed on a mobile frame. The gas storage tank 4 is vertical, with a volume of 20 liters, welded from Q345R steel plate, and coated with an anti-rust layer. The top of the tank has a safety valve 20 (opening pressure 0.95MPa) and a pressure sensor 21. The bottom of the tank is conical, with a ball valve and drain valve 22 installed at the lowest point. A short braided pipe 5 connects the upper part of the tank to the pressure regulating filter unit 6, making the entire gas path very short.

[0034] The pressure regulating filter unit 6 has its inlet connected to the outlet of the air storage tank 4 via a pipeline. Inside, it has at least one oil-water separator, a filter element, and a manual pressure regulating valve connected in series. The pressure regulating filter unit 6 has an aluminum valve body. The air passage first passes through the first-stage oil-water separator. After the compressed air rotates, it throws water droplets and impurities against the cup wall and collects them at the bottom of the cup, which are then discharged through the push-pull valve at the bottom. Then, the airflow goes upward through a sintered glass fiber filter element with a precision of 0.1 microns to remove residual oil mist and water vapor. Finally, clean air enters the manual pressure regulating valve. An output pressure gauge can be connected after the valve, and the air outlet pipe 7 leads to the air inlet connector of the paint tank 9.

[0035] The sealing material tank 10 has an air inlet and an outlet. The air inlet is connected to the outlet of the pressure regulating filter unit 6 via an air pipe, and the outlet is connected to the spray gun via the paint filter 8 inside the tank and the external delivery pipe 11. The paint tank 9 is made of 304 stainless steel and has a volume of 15 liters. The tank lid is sealed with a quick-release buckle and a silicone ring, and has an air inlet, an outlet, and a safety exhaust valve. The air inlet is connected to a suction tube inside the tank, and a cylindrical stainless steel wire mesh filter 8 is screwed onto the lower end of the suction tube. The outlet is connected to a pressure-resistant delivery pipe 11 outside the tank, and the other end is connected to the paint 9 inlet of the air spray gun 12. The atomizing air for the spray gun is supplied by a separate small air pipe led out from another interface on the air storage tank 4 to ensure the high pressure required for atomization. This part is conventional auxiliary air and is not further specified.

[0036] The control panel 17 is mounted on the top front of the frame, tilted for easy operation while standing. The control panel 17 includes a main power switch, an emergency stop button, running status indicator lights, and a digital pressure display for the air tank 4. The emergency stop button is connected in series in the enable circuit of the brushless motor drive controller. The rear housing of the control panel 17 integrates an AC-DC conversion power supply module and the brushless motor drive controller. The brushless motor drive controller is electrically connected to the pressure sensor 21 on the air tank 4 to obtain pressure signals and is also electrically connected to the DC brushless motor 14 to control its start / stop and speed. An external 220V AC power supply is connected to the input terminal of the AC-DC conversion module via the main power switch, and the output voltage of this module is connected to the DC bus of the brushless motor drive controller. The brushless motor drive controller obtains the pressure signal from the pressure sensor 21 on the air tank 4 in real time, determines whether to drive the motor, and outputs a three-phase PWM current to the DC brushless motor 14 when necessary. A Hall sensor integrated at the motor tail feeds back the rotor position signal to the brushless motor drive controller, achieving precise commutation. The operation indicator light on control panel 17 is controlled by the digital output port of the brushless motor drive controller. The pressure digital display of air tank 4 receives analog signals from the brushless motor drive controller and displays the pressure value in real time. The emergency stop button is connected in series in the controller enable circuit. When pressed, the drive output is cut off, and the motor stops immediately. It must be manually unscrewed to reset. The output pressure gauge at the outlet of pressure regulating filter unit 6 is purely mechanical, without electrical connection, and directly senses the pressure of the output air path. In embodiments with speed adjustment function, the mode selection knob on control panel 17 sends a switch signal to the controller's digital input port, and the internal program of the brushless motor drive controller adjusts the motor speed curve according to the selected mode.

[0037] All the above components are integrated and installed on the same mobile frame 13. The air circuit connection between them is changed to short pipe 5 or direct docking, which shortens the entire pressure path from the air compressor exhaust valve to the air inlet of the paint tank 9 by a large margin compared with the traditional split solution. The pressure transmission is fast and the loss along the way is small.

[0038] To use, first pour the adjusted viscosity paint 9 into the can, filling it no more than seven-tenths full, and tighten the cap. Connect to a 220V power supply and turn on the switch. At this time, the can pressure is 0. The controller detects that the pressure is below 0.45MPa, which triggers a soft start on the brushless motor, and the four-cylinder air compressor starts working. The four pistons alternately compress, and the airflow is injected into the air tank 4 through the double one-way valve. After a few seconds, the can pressure rises to 0.8MPa, and the motor stops. Then, turn the pressure regulating valve knob to set the output to, for example, 0.28MPa. The compressed air enters the paint 9 can after being filtered and pressure regulated through a short air path, pressurizing the surface of the paint 9. Pull the spray gun trigger, and the paint 9 is drawn in from the filter, passes through the feed pipe 11 to the spray gun, and is dispersed into a uniform paint mist by the additional high-pressure air supplied. During spraying, the can pressure gradually decreases. When it drops to around 0.5MPa, the motor automatically restarts to replenish air. Because the air replenishment flow of the four cylinders is much greater than that of a single gun, the can pressure rises rapidly, and no pressure change is felt at the spray gun, resulting in a consistent paint surface.

[0039] After construction is complete, turn off the power, open the lid of paint can 9 to clean it, and then open the drain valve 22 at the bottom of gas tank 4 to drain the condensate. If there is water in the filter cup, simply push it out. That's all for daily use.

[0040] Based on the above basic configuration, some improvements can be made. For example, the DC brushless motor 14 can be equipped with an AC-DC converter and drive controller, which can accept a wide voltage range of 160V to 260V to adapt to the fluctuating power supply on the construction site. The controller receives the signal from the pressure sensor 21 on the air tank 4. When the pressure is lower than the set start value, the motor automatically starts to pump air, and when the stop value is reached, it stops completely. When not pumping air, the motor consumes zero power and there is no whirring sound when no load is applied. A suitable hysteresis is left between the start value and the stop value to avoid repeated tripping.

[0041] The four-cylinder air compressor itself uses an oil-free piston structure, eliminating the need for daily lubrication and fundamentally preventing oil mist from entering the compressor. The four cylinders are preferably arranged in a rectangle, allowing the inertial forces generated by the piston's up-and-down movement to largely cancel each other out. Combined with the underlying shock-absorbing pads, vibrations on the frame are minimal. The two parallel one-way valves on the exhaust side primarily increase the flow area and reduce exhaust resistance, while also improving the reliability of preventing backflow and providing some assistance in mitigating pulses.

[0042] The gas storage tank 4 is vertical, with a volume between 12 and 30 liters. The inner wall is rust-proofed, and the bottom is sloped to facilitate the collection of condensate into the drain valve 22. The cyclone separator in the pressure regulating filter unit 6 has a transparent water cup and a push-operated drain valve 22 below it. The precision filter element can be replaced according to the usage time.

[0043] The paint can be made into a quick-opening type, and can be adapted to various paints such as latex paint, metallic paint, and stone paint by changing different spray guns and nozzles.

[0044] The control panel 17 should ideally be designed with an upward-sloping surface so that people can see and operate it while standing without having to bend over.

[0045] Example 2: See Figure 5 This embodiment adds variable frequency speed control and stirring functions to the existing embodiment 1. The motor controller has a built-in program that automatically adjusts the speed according to the pressure drop rate, and two modes, "Quiet and Energy Saving" and "High Power," are set on the panel. When spraying at low flow rates or intermittently, the motor speed drops to around 1200 rpm, resulting in extremely low noise and power consumption; when spraying thick slurry with large openings and closings, the speed automatically increases to full speed of 2200 rpm to ensure sufficient air volume. This further optimizes energy consumption and noise.

[0046] In addition, a miniature pneumatic stirring motor 25 was installed inside the 9 cans of paint. The motor is driven by a small stream of air from the air storage tank 4, which slowly rotates the stirring paddle to prevent sand particles in the stone paint from settling. The stirring switch is controlled by a small needle valve, which can be turned on when needed.

[0047] The other structures and uses are the same as in Example 1.

[0048] Example 3: This embodiment presents a quick-cleaning design for easy color changing: a quick-drain outlet is added to the bottom of the paint can (9), and a replaceable flexible inner bag is included. Paint (9) is placed inside the inner bag, and the bag opening is sealed and connected to a straw. When pressurized, pressure is applied to the outer wall of the bag to expel paint (9). To change colors, simply replace the inner bag and rinse the straw and spray gun, eliminating the hassle of repeatedly brushing the can. This concept can also be applied to the aforementioned embodiments.

[0049] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0050] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A four-cylinder compression spraying machine, characterized in that, include: Mobile racks; The power compression assembly, supported on the frame by a shock-absorbing base, includes a DC brushless motor and a four-cylinder piston air compressor driven by it. The four-cylinder piston air compressor has four vertically arranged cylinders. The cylinder pistons are connected to a crankshaft via connecting rods. The phase difference of each crankshaft is configured to allow the four pistons to alternately compress and perform work. The exhaust ports of each cylinder are collected through an exhaust manifold and then connected to the air inlet of an air tank through at least two parallel one-way valves. The gas storage tank is fixed on the frame, and the tank body is equipped with a pressure sensor and a safety valve. The pressure regulating filter unit has its inlet connected to the outlet of the gas storage tank via a pipeline, and internally has at least one oil-water separator and a manual pressure regulating valve connected in series. The sealing material tank is equipped with an air inlet and a discharge outlet. The air inlet is connected to the outlet of the pressure regulating filter unit via an air pipe, and the discharge outlet is connected to the spray gun via the paint filter inside the tank and an external delivery pipe. The control panel is mounted on the rack, and the brushless DC motor and pressure sensor are both electrically connected to the control panel.

2. The four-cylinder compression spraying machine according to claim 1, characterized in that, The brushless DC motor is equipped with an AC-DC converter and a drive controller. The controller has an input voltage range of 160V to 260V and controls the start, stop or speed of the motor according to the pressure sensor signal of the gas storage tank to achieve on-demand gas supply.

3. The four-cylinder compression spraying machine according to claim 2, characterized in that, The four-cylinder piston air compressor is an oil-free lubricated type, with the four cylinders arranged vertically in a rectangular array, and the crankshaft crank phases differing by 180° sequentially; the two parallel one-way valves are spring-reset type structures, placed between the exhaust manifold and the air tank to increase the flow area, reduce exhaust resistance and prevent gas backflow.

4. The four-cylinder compression spraying machine according to claim 3, characterized in that, The bottom of the mobile frame is equipped with directional wheels and universal wheels with brakes, and the shock-absorbing base is composed of multiple rubber shock absorbers.

5. The four-cylinder compression spraying machine according to claim 1, characterized in that, The gas storage tank is a vertical pressure vessel with a water collection structure at the bottom that is inclined toward the drain valve; the pressure regulating filter unit includes a centrifugal coarse separator and a precision filter element connected in series, and the bottom of the coarse separator is equipped with a manual drain valve.

6. The four-cylinder compression spraying machine according to claim 1, characterized in that, The sealing material container is equipped with an agitator driven by compressed air or electricity.

7. The four-cylinder compression spraying machine according to any one of claims 1 to 6, characterized in that, The control panel integrates an AC-DC power conversion module and a brushless motor drive controller. The brushless motor drive controller is electrically connected to the pressure sensor on the gas tank to obtain the pressure signal, and is electrically connected to the DC brushless motor to control its start-stop and speed. The control panel is equipped with a main power switch, an emergency stop button, a running status indicator light, and a digital display of the gas tank pressure. The emergency stop button is connected in series in the enable circuit of the brushless motor drive controller.

8. The four-cylinder compression spraying machine according to claim 1, characterized in that, The controller of the brushless DC motor has a speed regulation function, which can automatically switch between low speed and high speed according to the rate of pressure drop in the gas tank, so as to realize variable gas supply.

9. The four-cylinder compression spraying machine according to claim 1, characterized in that, The sealing material container is equipped with a replaceable inner bag or a quick-drain cleaning port at the bottom.

10. The four-cylinder compression spraying machine according to claim 1, characterized in that, The spray gun is an air atomizing spray gun, in which atomizing compressed air is drawn from the air tank through an independent air pipe. The paint is squeezed out under the air pressure inside the tank and atomized by the compressed air at the gun body.

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